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The action soon after the start moves to East Africa, where we see how the anti-slave trade was pursued. The British were against slavery, but the Portuguese, the Americans, the Arabs, and some of the East African states were getting on with it whenever the British backs were turned.
Then we move to the Crimea, where we get a very good view of the naval participation in that war. If you want to know more about the Crimea, you should definitely read this book.
Finally we move to the Pacific, to Sydney and to Hawaii. Here again it is interesting, particularly with regard to the volcanoes of the Hawaii group of islands.